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Sintering characteristics of Y–Ba–Cu–oxide–Agx superconductors

Published online by Cambridge University Press:  31 January 2011

L. C. Pathak ,
S. K. Mishra ,
D. Bhattacharya  and
K. L. Chopra
L. C. Pathak
Affiliation:
National Metallurgical Laboratory, Jamshedpur, 831 007, India
S. K. Mishra
Affiliation:
National Metallurgical Laboratory, Jamshedpur, 831 007, India
D. Bhattacharya
Affiliation:
Materials Science Centre, Indian Institute of Technology, Kharagpur, 721 302, India
K. L. Chopra
Affiliation:
Department of Physics, Indian Institute of Technology, Delhi, 110 016, India
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Abstract

The sintering characteristics of Y–Ba–Cu–oxide (YBCO)–Agx (x = 0 to 1.2) using thermomechanical analyzer were systematically investigated to understand the sintering mechanism of the metal superconductor composites. The addition of Ag was observed to lower the sintering temperatures, and the apparent densities of the sintered compacts increased with x from 0 to 0.6. A further increase of x above 0.6 decreased the apparent densities of the sintered compacts. The presence of Ag globules in the YBCO–Ag compacts was observed by scanning electron microscopy and energy dispersive x-ray spectroscopy. The apparent activation energies for sintering of the powder compacts were estimated and observed to vary between 900 to 2000 kJ/mol. The formation of AgOx by absorbing oxygen from YBCO and sintering atmosphere possibly controls the sintering and superconducting behavior. Incorporation of Ag into the matrix modifies the weak-link characteristics from superconductor–insulator– normal–superconductor (S–I–N–S) to superconductor–normal–superconductor (S–N–S) type.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 11 , November 1999 , pp. 4148 - 4156
Copyright
Copyright © Materials Research Society 1999

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